He sounds really desperate so you should tread carefully, but I doubt he would actually rape you. If I was you, I would try and avoid him. Say you are a lesbian or you used to be a man to scare him off.

Its me again, it was good to hear from you the other day. I can imagine you must be busy, even though I envy the fact you're an undergraduate. Its a bit awkward really, my reason for writing...I guess what I wanted to say was, I've been attracted to you for a while, and its been good getting to know you. But I'd really like more out of this. I want to get to know you far deeper, emotionally, mentally and of course physically. I've wanted to **** you for a while now, I know that must sound terrible, but its true. You are so attractive and someone I really want.The thought of being with you and inside you is amazing and I'd hate to let you slip away"

I felt a little bit shocked by it, its from a guy I hardly know...but theres a definate attraction there.